Work to replace two Interstate 270 bridges over the Mississippi River in Madison County has reached the midway point with the completion of the south span. The joint project with the Missouri Department of Transportation is on track to wrap up in 2026.
The first of the twin bridge openings is expected to occur over four weeks in the following stages. Eastbound I-270 traffic was the first to be shifted to the new south span on two eastbound lanes. The westbound I-270 traffic will shift to the new bridge in January.
The overall $496.2 million joint project with MoDOT will replace the existing bridges with two structures that have wider shoulders to accommodate the eventual expansion of I-270 to three lanes in each direction. A companion $35.4 million MoDOT project will reconstruct the Riverview Drive interchange just west of the bridge.
Construction started in late 2022 and is anticipated to be complete in 2026. Visit the project website, 270mrb.org, for more information, including project maps, fact sheets and construction timeline.
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